See answer: For each of 521 prove each statement that is true and find a counterexample

Chapter 6, Problem 9

(choose chapter or problem)

For each of 5–21 prove each statement that is true and find a counterexample for each statement that is false. Assume all sets are subsets of a universal set U.

For all sets A, B, and C, if \(A \subseteq C\) and \(B \subseteq C\) then \(A \cup B \subseteq C\).

Text Transcription:

A subseteq C

B subseteq C

A cup B subseteq C

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